95 Cherokee A/C Problem

I went to turn on the A/C for the first time this year on the Cherokee,
and got nothing! (It worked fine last year.)

It appears the clutch is not engaging, there is no power to the clutch.
A quick swap of the relays made no diffrence.

Is anyobe aware of a thermal limiter fuse seperatly in the circuit (such
as GM's)? Any ideas where to look first? Unfortunatly I don't have a
shop manual or wiring diagram available, so if anyone knows where a
wiring diagram may be posted on the net, that would be a help!

Thanks for your help on this!

Dave

With the '96, if the coolant's low (say from a leak), the ac won't run. But,
it should have been running ('96) for you in defrost setting. Maybe start
there ... does it run in defrost?

> I went to turn on the A/C for the first time this year on the Cherokee,
> and got nothing! (It worked fine last year.)
>

> Thanks for your help on this!
>
> Dave
>

Clarification ... I should have written refrigerant ... not coolant.

Bowgus

Dave did pass the time by typing:
> I went to turn on the A/C for the first time this year on the Cherokee,
> and got nothing! (It worked fine last year.)
>
> It appears the clutch is not engaging, there is no power to the clutch.
> A quick swap of the relays made no diffrence.
>
> Is anyobe aware of a thermal limiter fuse seperatly in the circuit (such
> as GM's)? Any ideas where to look first? Unfortunatly I don't have a
> shop manual or wiring diagram available, so if anyone knows where a
> wiring diagram may be posted on the net, that would be a help!

There are two interlocks. A high pressure limit switch on the compressor
output and a low level/cycle switch on the accumulator. If your low on
R134a like I suspect the low limit switch is probably not allowing the
compressor to run.

You can force it to run but should measure what pressure you have first.

All it takes to bypass the low limit switch is to short out the harness
pins.

If your low, only add R134a, do not add additional oil.

FYI, locally a repair/recharge runs about 150-200$

as for a schematic..
http://www.revbeergoggles.com/temp/zj-59.jpg


--
DougW

DougW did pass the time by typing:

> You can force it to run but should measure what pressure you have first.
>
> All it takes to bypass the low limit switch is to short out the harness
> pins.

Need to add something.. Don't force it to run more than it takes to suck
in the recharge coolant or test the system. That's simply a test, not a
solution for low refrigerant.

--
DougW